<?php
// +----------------------------------------------------------------------
// | ThinkPHP [ WE CAN DO IT JUST THINK IT ]
// +----------------------------------------------------------------------
// | Copyright (c) 2006-2012 http://thinkphp.cn All rights reserved.
// +----------------------------------------------------------------------
// | Licensed ( http://www.apache.org/licenses/LICENSE-2.0 )
// +----------------------------------------------------------------------
// | Author: liu21st <liu21st@gmail.com>
// +----------------------------------------------------------------------

/**
 * ThinkPHP内置的Dispatcher类
 * 完成URL解析、路由和调度
 * @category   Think
 * @package  Think
 * @subpackage  Core
 * @author    liu21st <liu21st@gmail.com>
 */
class Dispatcher {

	/**
	 * URL映射到控制器
	 * @access public
	 * @return void
	 */
	static public function dispatch() {
		$urlMode  =  C('URL_MODEL');
		if(!empty($_GET[C('VAR_PATHINFO')])) { // 判断URL里面是否有兼容模式参数
			$_SERVER['PATH_INFO']   = $_GET[C('VAR_PATHINFO')];
			unset($_GET[C('VAR_PATHINFO')]);
		}
		if($urlMode == URL_COMPAT ){
			// 兼容模式判断
			define('PHP_FILE',_PHP_FILE_.'?'.C('VAR_PATHINFO').'=');
		}elseif($urlMode == URL_REWRITE ) {
			//当前项目地址
			$url    =   dirname(_PHP_FILE_);
			if($url == '/' || $url == '\\')
			$url    =   '';
			define('PHP_FILE',$url);
		}else {
			//当前项目地址
			define('PHP_FILE',_PHP_FILE_);
		}

		// 开启子域名部署
		if(C('APP_SUB_DOMAIN_DEPLOY')) {
			$rules      = C('APP_SUB_DOMAIN_RULES');
			$subDomain  = strtolower(substr($_SERVER['HTTP_HOST'],0,strpos($_SERVER['HTTP_HOST'],'.')));
			define('SUB_DOMAIN',$subDomain); // 二级域名定义
			if($subDomain && isset($rules[$subDomain])) {
				$rule =  $rules[$subDomain];
			}elseif(isset($rules['*'])){ // 泛域名支持
				if('www' != $subDomain && !in_array($subDomain,C('APP_SUB_DOMAIN_DENY'))) {
					$rule =  $rules['*'];
				}
			}
			if(!empty($rule)) {
				// 子域名部署规则 '子域名'=>array('分组名/[模块名]','var1=a&var2=b');
				$array  =   explode('/',$rule[0]);
				$module =   array_pop($array);
				if(!empty($module)) {
					$_GET[C('VAR_MODULE')]  =   $module;
					$domainModule           =   true;
				}
				if(!empty($array)) {
					$_GET[C('VAR_GROUP')]   =   array_pop($array);
					$domainGroup            =   true;
				}
				if(isset($rule[1])) { // 传入参数
					parse_str($rule[1],$parms);
					$_GET   =  array_merge($_GET,$parms);
				}
			}
		}
		// 分析PATHINFO信息
		if(empty($_SERVER['PATH_INFO'])) {
			$types   =  explode(',',C('URL_PATHINFO_FETCH'));
			foreach ($types as $type){
				if(0===strpos($type,':')) {// 支持函数判断
					$_SERVER['PATH_INFO'] =   call_user_func(substr($type,1));
					break;
				}elseif(!empty($_SERVER[$type])) {
					$_SERVER['PATH_INFO'] = (0 === strpos($_SERVER[$type],$_SERVER['SCRIPT_NAME']))?
					substr($_SERVER[$type], strlen($_SERVER['SCRIPT_NAME']))   :  $_SERVER[$type];
					break;
				}
			}
		}
		$depr = C('URL_PATHINFO_DEPR');
		if(!empty($_SERVER['PATH_INFO'])) {
			tag('path_info');
			$part =  pathinfo($_SERVER['PATH_INFO']);
			define('__EXT__', isset($part['extension'])?strtolower($part['extension']):'');
			if(C('URL_HTML_SUFFIX')) {
				$_SERVER['PATH_INFO'] = preg_replace('/\.('.trim(C('URL_HTML_SUFFIX'),'.').')$/i', '', $_SERVER['PATH_INFO']);
			}elseif(__EXT__) {
				$_SERVER['PATH_INFO'] = preg_replace('/.'.__EXT__.'$/i','',$_SERVER['PATH_INFO']);
			}
			if(!self::routerCheck()){   // 检测路由规则 如果没有则按默认规则调度URL
				$paths = explode($depr,trim($_SERVER['PATH_INFO'],'/'));
				if(C('VAR_URL_PARAMS')) {
					// 直接通过$_GET['_URL_'][1] $_GET['_URL_'][2] 获取URL参数 方便不用路由时参数获取
					$_GET[C('VAR_URL_PARAMS')]   =  $paths;
				}
				$var  =  array();
				if (C('APP_GROUP_LIST') && !isset($_GET[C('VAR_GROUP')])){
					$var[C('VAR_GROUP')] = in_array(strtolower($paths[0]),explode(',',strtolower(C('APP_GROUP_LIST'))))? array_shift($paths) : '';
					if(C('APP_GROUP_DENY') && in_array(strtolower($var[C('VAR_GROUP')]),explode(',',strtolower(C('APP_GROUP_DENY'))))) {
						// 禁止直接访问分组
						exit;
					}
				}
				if(!isset($_GET[C('VAR_MODULE')])) {// 还没有定义模块名称
					$var[C('VAR_MODULE')]  =   array_shift($paths);
				}
				$var[C('VAR_ACTION')]  =   array_shift($paths);
				// 解析剩余的URL参数
				preg_replace('@(\w+)\/([^\/]+)@e', '$var[\'\\1\']=strip_tags(\'\\2\');', implode('/',$paths));
				$_GET   =  array_merge($var,$_GET);
			}
			define('__INFO__',$_SERVER['PATH_INFO']);
		}

		// URL常量
		define('__SELF__',strip_tags($_SERVER['REQUEST_URI']));
		// 当前项目地址
		define('__APP__',strip_tags(PHP_FILE));

		// 获取分组 模块和操作名称
		if (C('APP_GROUP_LIST')) {
			define('GROUP_NAME', self::getGroup(C('VAR_GROUP')));
			// 分组URL地址
			define('__GROUP__',(!empty($domainGroup) || strtolower(GROUP_NAME) == strtolower(C('DEFAULT_GROUP')) )?__APP__ : __APP__.'/'.GROUP_NAME);
		}

		// 定义项目基础加载路径
		define('BASE_LIB_PATH', (defined('GROUP_NAME') && C('APP_GROUP_MODE')==1) ? APP_PATH.C('APP_GROUP_PATH').'/'.GROUP_NAME.'/' : LIB_PATH);
		if(defined('GROUP_NAME')) {
			if(1 == C('APP_GROUP_MODE')){ // 独立分组模式
				$config_path    =   BASE_LIB_PATH.'Conf/';
				$common_path    =   BASE_LIB_PATH.'Common/';
			}else{ // 普通分组模式
				$config_path    =   CONF_PATH.GROUP_NAME.'/';
				$common_path    =   COMMON_PATH.GROUP_NAME.'/';
			}
			// 加载分组配置文件
			if(is_file($config_path.'config.php'))
			C(include $config_path.'config.php');
			// 加载分组别名定义
			if(is_file($config_path.'alias.php'))
			alias_import(include $config_path.'alias.php');
			// 加载分组函数文件
			if(is_file($common_path.'function.php'))
			include $common_path.'function.php';

		}
		define('MODULE_NAME',self::getModule(C('VAR_MODULE')));
		define('ACTION_NAME',self::getAction(C('VAR_ACTION')));

		// 当前模块和分组地址
		$moduleName    =   defined('MODULE_ALIAS')?MODULE_ALIAS:MODULE_NAME;
		if(defined('GROUP_NAME')) {
			define('__URL__',!empty($domainModule)?__GROUP__.$depr : __GROUP__.$depr.$moduleName);
		}else{
			define('__URL__',!empty($domainModule)?__APP__.'/' : __APP__.'/'.$moduleName);
		}
		// 当前操作地址
		define('__ACTION__',__URL__.$depr.(defined('ACTION_ALIAS')?ACTION_ALIAS:ACTION_NAME));
		//保证$_REQUEST正常取值
		$_REQUEST = array_merge($_POST,$_GET);
	}

	/**
	 * 路由检测
	 * @access public
	 * @return void
	 */
	static public function routerCheck() {
		$return   =  false;
		// 路由检测标签
		tag('route_check',$return);
		return $return;
	}

	/**
	 * 获得实际的模块名称
	 * @access private
	 * @return string
	 */
	static private function getModule($var) {
		$module = (!empty($_GET[$var])? $_GET[$var]:C('DEFAULT_MODULE'));
		unset($_GET[$var]);
		if($maps = C('URL_MODULE_MAP')) {
			if(isset($maps[strtolower($module)])) {
				// 记录当前别名
				define('MODULE_ALIAS',strtolower($module));
				// 获取实际的模块名
				return   $maps[MODULE_ALIAS];
			}elseif(array_search(strtolower($module),$maps)){
				// 禁止访问原始模块
				return   '';
			}
		}
		if(C('URL_CASE_INSENSITIVE')) {
			// URL地址不区分大小写
			// 智能识别方式 index.php/user_type/index/ 识别到 UserTypeAction 模块
			$module = ucfirst(parse_name($module,1));
		}
		return strip_tags($module);
	}

	/**
	 * 获得实际的操作名称
	 * @access private
	 * @return string
	 */
	static private function getAction($var) {
		$action   = !empty($_POST[$var]) ?
		$_POST[$var] :
		(!empty($_GET[$var])?$_GET[$var]:C('DEFAULT_ACTION'));
		unset($_POST[$var],$_GET[$var]);
		if($maps = C('URL_ACTION_MAP')) {
			if(isset($maps[strtolower(MODULE_NAME)])) {
				$maps =   $maps[strtolower(MODULE_NAME)];
				if(isset($maps[strtolower($action)])) {
					// 记录当前别名
					define('ACTION_ALIAS',strtolower($action));
					// 获取实际的操作名
					return   $maps[ACTION_ALIAS];
				}elseif(array_search(strtolower($action),$maps)){
					// 禁止访问原始操作
					return   '';
				}
			}
		}
		return strip_tags(C('URL_CASE_INSENSITIVE')?strtolower($action):$action);
	}

	/**
	 * 获得实际的分组名称
	 * @access private
	 * @return string
	 */
	static private function getGroup($var) {
		$group   = (!empty($_GET[$var])?$_GET[$var]:C('DEFAULT_GROUP'));
		unset($_GET[$var]);
		return strip_tags(C('URL_CASE_INSENSITIVE') ?ucfirst(strtolower($group)):$group);
	}

}